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Re: Dave's Carb Mods

Posted: Tue Jun 12, 2018 10:17 am
by treydouglass
Thanks for the response Joe. I'll do as you suggest and see if that flushes out the valve.

Re: Dave's Carb Mods

Posted: Sat Jul 07, 2018 8:30 pm
by Randy777
Hey I just want to thank Dave and everyone who chimed in on this Mod. I finally got the time to do it and I am overwhelmed with the difference. I ordered a 158 and 55 as my altitude is about 2200 here in Boulder City, NV. I ordered the OEM jets instead of the more expensive Keihin jets so for about $20.00 I have a much faster bike. My 08 650 runs like a scalded cat.
The Mod only took about an hour so once again guys thank you very much.

Randy

Re: Dave's Carb Mods

Posted: Sat Jul 07, 2018 8:46 pm
by JoeRC51
The OEM jets ARE Keihin.

Re: Dave's Carb Mods

Posted: Mon Aug 06, 2018 1:44 pm
by jasontojo
I am having issues after doing the dave's carb mod. Everything seems well and good until I reach speeds above 65 mph. The motor begins to stumble and acts like it is starving for gas.
I live at 1100 ft. and should not be having jetting issues. I had the bike set up with a dyno jet kit from the Honda dealer at the time I bought the bike back in 2013. Ran great but we have #$%^ gas here and I left the carb over winter with out winterizing it and had to rebuild the carb with a moose kit seeing that it had all the parts.
Any help would be great because I need my two wheel fix here.

Re: Dave's Carb Mods

Posted: Mon Aug 06, 2018 2:56 pm
by JoeRC51
You can drill the slide and use the DJ kit , you can use the DJ spring with Dave's mod , BUT you CAN NOT mix Mikuni jets and needles with DJ jets and needles. They both use different numbering systems and the needles only work well with the appropriate jets.

Re: Dave's Carb Mods

Posted: Mon Aug 06, 2018 3:00 pm
by jasontojo
I used the jets that came with the kit however I did use a jetting drill set to over size the hole. Would this cause the issue? I drilled the main to 160

Re: Dave's Carb Mods

Posted: Mon Aug 06, 2018 3:37 pm
by JoeRC51
Try riding it with the left side cover off of the airbox , if it's better , your too rich.

Re: Dave's Carb Mods

Posted: Mon Nov 12, 2018 5:27 am
by davisjj
How important is enlarging the two holes in the bottom of the slide to 5/32", and what function does it serve?

Re: Dave's Carb Mods

Posted: Mon Nov 12, 2018 4:26 pm
by JoeRC51
It lets the slide open faster for better throttle response. Some of the jet kits have a lighter slide spring for the same purpose. I had the lighter spring AND I drilled my slide before I went to a Mikuni TM40-6 pumper carb.

Re: Dave's Carb Mods

Posted: Sun Nov 25, 2018 9:48 am
by davisjj
Is this the airbox snorkel the post mentions removing?